Trend shows how the quality of water is changing over time. Depending on the sampling history duration, five and ten year timescales are available:

Can I trust this data?

The Cawthron Institute has worked alongside regional councils to verify the processes and methods used for data collection, laboratory analysis of samples collected, quality assurance and the statistical analysis and interpretation of the results presented.

Lake water quality is being monitored in this region. Proposed National Guidelines suggest that all councils should monitor lake water quality as part of their State of the Environment Monitoring Programmes, if lakes occur in the region.

State - Sampling

All samples were collected using approved field protocols and have been analysed in accredited laboratories.

State - Quality Assurance - Data Processing

Data at this site has had some form of data processing measures applied. Therefore, the data shown here are more robust than data with no data processing applied.

State - Quality Assurance - Quality Coding

Data shown for this site has had quality coding applied to it, following the NEMS recommendations. The data shown here is therefore robust and can be trusted.

Trend - Sampling Frequency

Samples are collected quarterly at this site. Proposed national guidelines suggest monthly sampling is required for robust trend analysis. Therefore, any trends shown here are less robust than those calculated from data collected monthly.

Phosphorus

Total Phosphorus

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State

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Trend

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Total Phosphorus sample history at this site

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Total Phosphorus samples for Lake Pupuke

mg/m³

Date

What is this graph showing me?

This graph is displaying Total Phosphorus concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Lake ecological communities have undergone or are at high risk of a regime shift to a persistent, degraded state, due to impacts of elevated nutrients leading to excessive algal growth and/or plant growth, as well as from losing oxygen in bottom waters of deep lakes

Nitrogen

Nitrogen

State

Trend

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Total Nitrogen sample history at this site

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Total Nitrogen samples for Lake Pupuke

mg/m³

Date

What is this graph showing me?

This graph is displaying Total Nitrogen concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Lake ecological communities have undergone or are at high risk of a regime shift to a persistent, degraded state, due to impacts of elevated nutrients leading to excessive algal growth and/or plant growth, as well as from losing oxygen in bottom waters of deep lakes

Nitrogen

State

Trend

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Ammonia sample history at this site

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Ammonia samples for Lake Pupuke

mg NH4-N/l

Date

What is this graph showing me?

This graph is displaying Ammoniacal Nitrogen concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

Lake ecological communities have undergone or are at high risk of a regime shift to a persistent, degraded state, due to impacts of elevated nutrients leading to excessive algal growth and/or plant growth, as well as from losing oxygen in bottom waters of deep lakes

Algae

State

Trend

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Cyanobacteria sample history at this site

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Cyanobacteria samples for Lake Pupuke

mm³/l

Date

What is this graph showing me?

What do the icons mean?

It is important to note that changes to the National Policy Statement for Freshwater Management 2014 were announced in August 2017. The changes have modified the NOF bands for planktonic cyanobacteria. These changes came into effect on 6 September 2017. The data on LAWA has not yet been updated to reflect the new requirements.

The bands for Cyanobacteria are as outlined in the NOF for freshwater:

A

Risk exposure from cyanobacteria is no different to that in natural conditions (from any contact with fresh water)

B

N/A

C

Low risk of health effects from exposure to cyanobacteria (from any contact with fresh water)

Bacteria

State

Trend

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E. coli sample history at this site

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E. coli samples for Lake Pupuke

n/100ml

Date

What is this graph showing me?

This graph is displaying E. coli concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. This data is raw and has not had any methodology applied to it.

What do the icons mean?

It is important to note that changes to the National Policy Statement for Freshwater Management 2014 were announced in August 2017. The changes have removed the below set of criteria for E. coli, and any reference to this use of water (i.e. occasional immersion). The new criteria, effective from 6 September 2017, are for the use of water for swimming and other full contact, sustained exposure activities (diving, surfing etc). The data on LAWA has not yet been updated to reflect the new requirements.

The bands for E. coli are as outlined in the NOF for freshwater:

A

People are exposed to a very low risk of infection (less than 0.1% risk) from contact with water during activities with occasional immersion (such as wading and boating)

B

People are exposed to a low risk of infection (less than 1% risk) from contact with water during activities with occasional immersion (such as wading and boating)

C

People are exposed to a moderate risk of infection (less than 5% risk) from contact with water during activities with occasional immersion (such as wading and boating)

National bottom line: Annual median 1000/100mL

D

People are exposed to a high risk of infection (greater than 5% risk) from contact with water during activities with occasional immersion (such as wading and boating)

Download Data

.ZIP file of lake data.

Disclaimer

LAWA Partners shall not be liable, whether in contract, tort, equity or otherwise, for any loss or damage of any type (including consequential losses) arising directly or indirectly from the inadequacy, inaccuracy or any other deficiency in information supplied irrespective of the cause. Use of information supplied is entirely at the risk of the recipient and shall be deemed to be acceptance of this liability exclusion.

Recreation

Recreation information has moved to the "Can I Swim Here?" section of LAWA